Under OSHA’s Hazard Communication Standard, acetic acid label requirements come down to six elements that must appear on every shipped container: a product identifier, a signal word, hazard statements, pictograms, precautionary statements, and the manufacturer’s U.S. contact information. The exact signal word, pictograms, and statements change with concentration, so a label for glacial acetic acid looks different from one for a 15 percent solution. If the container is also being shipped, the Department of Transportation adds its own labels on top.
The Six Elements OSHA Requires
29 CFR 1910.1200 aligns U.S. workplace chemical labeling with the Globally Harmonized System. Every shipped container of acetic acid must carry all six of the following:
- Product identifier matching the name on the Safety Data Sheet.
- Signal word, either “Danger” or “Warning,” based on the hazard category.
- Hazard statements, standardized phrases such as “Causes severe skin burns and serious eye damage.”
- Pictograms, the red-bordered diamond symbols.
- Precautionary statements covering prevention, response, storage, and disposal.
- Name, U.S. address, and U.S. telephone number of the manufacturer, importer, or other responsible party.
Miss one and the label is out of compliance, even if the other five are correct.1eCFR. 29 CFR 1910.1200 – Hazard Communication
How Concentration Changes the Label
Signal Word
Acetic acid solutions at or above 25 percent are classified as skin corrosion Category 1, with sub-category 1A above 90 percent and 1B from 25 to 90 percent. Every Category 1 classification requires “Danger.” Solutions from 10 to 25 percent fall into skin irritation Category 2, which uses “Warning.” Below 10 percent, the acid generally does not meet the threshold for a skin hazard classification at all.
Glacial acetic acid also qualifies as a flammable liquid Category 3, since its flash point sits near 39°C (102°F). That category on its own carries “Warning,” but GHS rules require the more severe signal word when multiple hazards apply, so only “Danger” appears on the label.2National Institutes of Health. GHS Classification Summary
Pictograms
Concentrations that trigger the corrosion classification need the GHS05 corrosion pictogram, showing liquid eating into a surface and a hand. When the concentration is high enough to be flammable, generally above 80 percent, the GHS02 flame pictogram is required as well. Acetic acid is not classified as an aquatic toxicant, so no environmental pictogram appears.
Hazard Statements
Hazard statements are prescribed codes tied to the classification and must appear exactly as written. Glacial or highly concentrated acetic acid carries H226 (“Flammable liquid and vapour”) and H314 (“Causes severe skin burns and serious eye damage”). A dilute solution that only qualifies as a skin irritant carries H315 (“Causes skin irritation”) and drops the flammability statement where the flash point no longer applies.
Product Identifier and Concentration
The identifier on the label has to match the name used on the Safety Data Sheet, and adding the Chemical Abstracts Service registry number 64-19-7 removes any ambiguity. The concentration itself must be clearly stated. The gap between glacial acetic acid at nearly 100 percent purity and a 5 percent cleaning solution is the difference between a chemical burn and something close to strong vinegar, and a missing or inaccurate concentration figure is a common source of both injuries and civil liability.1eCFR. 29 CFR 1910.1200 – Hazard Communication
Grade matters too. Food-grade acetic acid is regulated under 21 CFR 184.1005, which recognizes it as generally recognized as safe (GRAS) but caps its concentration in finished foods (for example, 9 percent in condiments and relishes, 3 percent in gravies and sauces, and 0.15 percent in most other categories) and requires it to meet the Food Chemicals Codex. The bulk chemical itself is still hazardous, so its label carries the GHS information along with the purity statement.3eCFR. 21 CFR 184.1005 – Acetic Acid USP-grade acetic acid must be at least 99.7 percent pure and meet limits on heavy metals, residue, and microbial content. The label needs to reflect the actual grade so that no one downstream substitutes an industrial product where pharmaceutical grade is called for.
Precautionary Statements
GHS precautionary statements fall into four groups, and all four have to appear on the label where the hazard classification calls for them:
- Prevention: wear protective gloves, eye protection, and face protection; keep away from heat, sparks, and open flames.
- Response: flush skin immediately with water, remove contaminated clothing, seek medical attention if vapors are inhaled.
- Storage: cool, well-ventilated area, away from incompatible materials.
- Disposal: dispose of chemical and container in compliance with environmental regulations.
Each statement has to match the hazard category assigned to that concentration. Glacial acetic acid carries more precautionary statements than a dilute solution because it triggers both corrosion and flammability categories. If a worker is later injured, missing or wrong statements can be used as evidence of negligence.1eCFR. 29 CFR 1910.1200 – Hazard Communication
On storage, the accompanying Safety Data Sheet has to spell out the specific incompatibilities: strong oxidizers such as chromic acid, nitric acid, perchloric acid, peroxides, and permanganates, along with alcohols and ethylene glycol. Many manufacturers repeat those warnings on the label itself.
Manufacturer and Emergency Contact
The label must display the name, physical U.S. address, and U.S. telephone number of the manufacturer, importer, or other responsible party. That is the element that connects the container to a real entity that can supply toxicity data during an incident. A general business number satisfies the minimum, but most manufacturers add a 24-hour emergency number, often routed through a service like CHEMTREC, so first responders can get chemical-specific guidance immediately.1eCFR. 29 CFR 1910.1200 – Hazard Communication
Secondary Containers in the Workplace
When acetic acid is transferred from its original shipping container into a secondary container at the workplace, the labeling requirement is lighter. Under 29 CFR 1910.1200(f)(6), a secondary container needs the product identifier along with words, pictures, or symbols conveying general hazard information. The full six-element GHS label is not required so long as the employer’s hazard communication program supplies the rest through immediately accessible Safety Data Sheets.4Occupational Safety and Health Administration. Labeling of Secondary Containers
Portable containers filled by an employee for their own immediate use need no label at all. Once that container might be used by someone else, or sits until the next shift, the labeling requirement returns.1eCFR. 29 CFR 1910.1200 – Hazard Communication An employer using any alternative labeling system that omits full health effects information carries the burden of proof in enforcement to show the system provides at least the same level of employee awareness as a complete GHS label.4Occupational Safety and Health Administration. Labeling of Secondary Containers
Small Containers That Cannot Fit a Full Label
Vials and other small containers can use pull-out labels, fold-back labels, or tags to hold all six elements. Where none of those methods is feasible, the small container must at minimum carry the product identifier, the appropriate pictograms, the signal word, the manufacturer’s name and phone number, and a statement pointing the user to the outer packaging for full label information. The outer package then holds the complete GHS label and must be kept intact.5Occupational Safety and Health Administration. NIST Labeling of Small Packages
A numbering or coding system that links the small container to a separate reference sheet does not satisfy the standard for shipped containers. The information has to be physically attached to or associated with the immediate container.
DOT Labels for Shipping
When acetic acid is shipped by road, rail, air, or water, DOT requires its own labels in addition to the workplace GHS label. Classification tracks concentration:
- Above 80 percent, including glacial: Hazard Class 8 (corrosive) with subsidiary Class 3 (flammable liquid), Packing Group II. Both the corrosive label and the flammable liquid label are required. UN number 2789.
- 50 to 80 percent: Hazard Class 8 (corrosive), Packing Group II. Corrosive label only.
- 10 to 50 percent: Hazard Class 8 (corrosive), Packing Group III. Corrosive label only, at the lower packing group.
The proper shipping name, “Acetic acid, glacial” or “Acetic acid solution,” appears on the shipping documentation and outer packaging along with the UN number and hazard labels.6eCFR. 49 CFR 172.101 – Purpose and Use of the Hazardous Materials Table
Penalties for Labeling Violations
Labeling failures under the Hazard Communication Standard are among the most frequently cited OSHA infractions. As of 2025, a serious violation, including an inadequate or missing chemical label, can draw up to $16,550. Willful or repeated violations carry a maximum of $165,514 per violation. Both figures are adjusted annually for inflation.7Occupational Safety and Health Administration. OSHA Penalties
Penalties apply per violation, so each unlabeled or mislabeled container can be cited on its own. A facility with a dozen improperly labeled drums of acetic acid can face a dozen citations. And when a labeling failure precedes a worker injury, the requirements themselves supply the negligence argument in civil litigation: the rules exist to prevent the harm that occurred, and falling short of them is hard to defend.